Improvement in lifting-jacks



UNITED STATES PATENT OEEIGE.

JOHN RIDDLESBERGER, OF WAYNESBOROUGH, PENNSYLVANIA.

IMPROVEMENT IN LIFTING-JACKS.

Specification forming part of Letters Patent No. 87,292, dated February23, 1869.

To alt whom it may concern Be it known that I, JOHN RIDDLESBERGER, ofWaynesborough, in the county of Franklin and State of Pennsylvania, haveinvented a new and usefulIm provement in Lifting-Jacks and I do herebydeclare that the following is a full, clear, and exact description ofthe same, reference being had to the annexed drawings, making part ofthis specication, in which- Figure 1 is a vertical elevation of myimproved jack. Fig. 2 is an end view of the same.

Corresponding letters refer to corresponding parts in both iigures.

This invention relates to an improvement in lifting-jacks; and itconsists in the combination and arrangement of the parts of which itcrmposed, as willbe more fully described herea ter.

A, A', andB represent the frame-work of the jack, A being the principalstandard or post, while A is an auxiliary post or standard, which may besecured to A by being caused to pass through a inortise or slot formedtherein, or it may be attached to the side thereof and secured by abolt.

It will be observed that that portion of A which passes through theprincipal post has formed upon its under side a series of notches, whichare for the reception of the link D. That portion of the frame-workmarked B, it will be seen, acts as a brace, and serves to strengthen theparts A and A'.

O represents a lever, which rests within a slot formed in the upper endof the post or standard A, to the sides of which it is pivoted and heldin position by bolt E. The short arm of this lever is to be placed underor in some way connected with the weight to be raised, while theopposite or longer arm is to be borne down until the carriage or otherweight has been raised to the required height, when the link D, which issecured to the upper side of this arm of the lever, is caused to engagewith the notch upon the post A', which is necessary to retain theweightin its elevated position. The different positions which theseparts assume are clearly shown in Fig. l of the drawings.

D represents the link, which is secured to the lever O, and is held inits position thereon by means of a staple, which may be driven into suchlever.

E represents the bolt, which serves as afulcrum, upon which lever Oturns, and as the means for retaining it in its position in the post A.

F represents a bolt, which passes through the several parts of theframe, and is for the purpose of securing these parts in their relativepositions.

rEhe operation of this device is as follows: The parts being constructedand arranged as shown in the drawings, the short arm 0f the lever O isto be placed under the axle of a wagon or other weight to be raised,when the opposite or long arm of this lever is to be borne down, and asthe weight is raised the link D is to be caused to engage with thenotches formed upon the under side of post A', which secure the weightin its elevated position until the sameis released and the weightpermitted to return to its original position.

Having thus described my invention, what I claim, and desire to secureby Letters Patent is- The combination and arrangement of the posts orstandards A A', brace B, lever O, and link D, substantially as shown anddescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN RIDDLESBERGER.

Witnesses:

D. B. RUssELL, J. B. ItUssELL.

